Don't exclude langpacks-en explicitly
    
    A recent change to Anaconda[1] now requires that this be available on
    the installed system, due to grub2-tools-extra now being part of the
    EFI GRUB2 install.
    
    [1] https://github.com/rhinstaller/anaconda/commit/1891b0f306cc252e32335ac185a609df1828edb7
    
    Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>